Custom of sending the pieces of, to collect the people to war

1 Samuel 11:7 - And he took a yoke of oxen, and hewed them in pieces, and sent them throughout all the coasts of Israel by the hands of messengers, saying, Whosoever cometh not forth after Saul and after Samuel, so shall it be done unto his oxen. And the fear of the Lord fell on the people, and they came out with one consent.